Silk printing is an important classic printing technology for many application. Usually it is restricted to flat or at least very little curved surfaces. For printing the silk printing dye is distributed onto a sieve, containing the structure of the image to be printed.
Also metals can be silk printed. This is a technology to generate circuit paths on a circuit board alternate to fotolithography and Plasma etching. Usually silk printing is prefered if copper circuit paths are desired while plasma etching is used for aluminium.